Improvement in furnaces for reburning bone-black



GyTHLEMBYER. FURNAGB FOR REBURNING BONE BLACK.

' Nc. 40,371. Patented 00mn, 1.863.

' UNITED STATES- PATENT OFFICE.

GOTTFRIED vTHULEMEYER, 0F NEW YORK, N, Y.

, IMPROVEMENT v1N Fu'lzaiaoiae FoPL laletiannue BONE-BLACK.

vSpecification forming part of Letters PatentfNo. 410,371, dated October 20, 1863.

To all whom it may concern:

Be. it known that I, vGo'w'rFrtIED THULE- MEYER, ofthe city, county, and State' of New York, have invented a new and useful Improvement in Furnaces for Reburning Bone- Black, &'c.' 5 and I do hereby declare that the following is affull, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part ofI this specification, in which- Figure l represents a transverse vertical section of my invention, taken in the plane indicated by the line x cc, Fig. 3. Fig. 2 is a longitudinal vertical section ofthe same, the line lw w, Fig. '3, indicating the planeof section.v

Fig.3 is a plan or top View of the saine, partly in section. Fig. 4 is a part-ial side elevation of the saine.y

Similar letters of reference-in the several views indicatecorresponding parts.

This invention relates to certain improve- A. ments in the intern al 'ar-ran gement of the furnace wherebyy the heat is equally distributed all round the retorts and throughout their Aeni tire length, and consequently an even and uniform vheating of thebone-black or other substance-contained in the retorts is insured.

The invention also relates to a peculiarlyshaped retort, whereby a large quantity of bone-black or other material can be exposed simultaneously to the heat of the fire in a stratum of uniform and small thickness, and the whole mass can be heated evenly and uniformly with a comparatively small quantity of fuel.

To enable those skilled in the art tomake and use my invention, I will proceed to describe it.

A represents a furnace, built up of brick or any other suitable material, and provided with .two tire-places, B B.

C (l are the retorts, which aremade in the shape of horseshoes, as clearly shown in Fig. 3 ofthe drawings.` The cross'section of each of these retorts presents a long thin space capable of receiving a comparatively large quantity ot? bone-black or other material, and

spreading thesame in a uniform thin stratum -over a large area, so that the 'heat caneasil y penetrate the entire mass. These retorts are arranged in two. or more rows between'the fire-places B B', andthey rest upon the bottom plate, D, of the furnace, and are steadied by a dividingplate, E, which maybe made in sections to facilitate its adjustment.

The bottom plate, D, is protected by a false bottom, F, having, an air-space, a, that preven ts the bottom ends of the retorts from being overheated or burned.

The partition-plate E completely separates the space below it from that above, and it extends back into the recesses between the two branches of each retort, leaving apertures b, through which the heat from the lire and the products of combustion mustl pass in order to reach the holes c in the side walls of the furnace. These holes lead through said side walls into ues (Z, which are built between the `double walls of the furnace, causing the heat.

or 'productsof combustion to descend into the horizontal ues e, which extend to the ends of the furnace and communicate with the inclined ilues f, leading to the chimney. By this arrangement the heat, after passin gup through the apertures b, is compelled to pass all round each of the retorts in order to reach the holes c in the side walls, and every part of each retort is 'then kept at a uniform temperature throughout the whole furnace. The boneblack can thus be heated slowly and uniformly throughout every retort, and the restoration of the same can be effected with a comparalively small expenditure of fuel, with little or no loss of bone-black, and in the most perfect manner.

The retorts are closed on the top by acover, G, common to all, which rests loosely on the top edge of the brick wall, and which is provided vWith ilanges g, projecting down into or over the several retorts, as clearly shown in Figs. 1 and 2.. This cover may be made of sheet-iron or any other suitable material, and it may be made in several sections to facilitate its removal. By removing this cover access can be had to the interior of the retorts.

The retorts are open at the bottom, and theyv empy into ieet H, which discharge through slides lr. When tl e hone-black or other material has been heated sufficiently, it is let down into thefeet H, where it cools, and when cold it is withdrawn through the slides h.

What I* claim as new, and desire to secure by Letters Patent, is.- 1. .The horseshoe-shaped retorts C, ar

ranged 'in the frnace A, in the manner and for the purpose substatally as'her'einvlshown and described. Y

V2, The partitionplate E, when made whole 0r in sections, and provided with apertures 11, in` combination with lthe'retorts G- mld furnace A, all constructed and operating substantially. as and for the prpose'setfortrh. f

'3. The arrnn gement of one or more series ofy etorts', C; between twof4 flre-ilaee, :B5 fili combination with thepartl'tmplate E, iside' ues, 1de, and' end u'es, f, all'construeted and operatingn' the manner vandi'o'r the purpse substantially as specifedf. i 1 1- -v GOTTFRIED `THULEMEYER. 

